Electric motor



I H. K. SANDELL' July 5, 1927. 1,634,852

H. K. SANDELL ELECTRIC IQ'I'OR Filed March 27. 1924 2 Shani-Shut 2 July 5,1927. 3 .852

Patented July 5, 1927.

HENRY K. SANDELL, OF CHICAGO, ILLINOIS.

ELECTRIC MOTOR.

Application filed March 27, 1924. Serial No. 702,298.

This invention relates to electric motors and the like and is fully described in the following specification and shown in the accon'ipai'iying drawings in which:

liigure 1 is an end elevation of a motor embodying the invention;

Fig. 2 is a horizontal section onthe line 2 2 of Fig. 1;

Fig. 3 is an enlarged vertical section on the line 3 of Fig. 1; and

Fig. 4 is a wiring diagram of the motor.

This motor is a modification of the one shown in my Patent N 0. 1,57 8,096, ,g'ranted March 23, 1926.

The embodiment illustrated comprises a frame l'iaving top and bottom pole pieces and 11 which are connected by field cores 12 which may either be of the fixed magnet type or of the wound electromagnet type as will readily be understood.

Yoke members 13 and 14 are connected to the top and bottom pole pieces by means of screws 15 and 1G and in these is journalled the shaft 17. r I

This shaft carries a member 18 to which are secured the armature cores or bar magnets 19 and 20 which are preferably made up of a series of laminated plates as shown in Fig. 3, which are soft iron, some of them having hardened or tempered outer ends which serve to increase the, retentivity of these bar magnets. Armature coils 21., 22, 23 and are wound about the ends of these cores which are spaced some distance apart as shown in F 1.. connected together by a lead 25, while a lead 26 connects the coils 23 and 24, and the free ends of the coils 21 and 23 are connected by means of a wire 27'. The free ends of the coils and 24 areconnected through leads 28 and 29 to the brushes 30 and 31 respectively, the latter being mounted in holders 32. These brushes bear upon the segments 3 1, 35, 36 and 37 which are mounted upon the insulating block 38, the latter being mounted on the yoke 14 and secured thereon by a screw 39. i

The segments 36 and 37 are connected through leads 40 and 41 toa source of current supply 42, while the segments 34 and are similarly connected through the leads 43 and 44 to a sourced?) of relatively low voltage current supply.

As the armature revolves the brushes and 31 rotate in 'a clockwise direction shown in Fig. 1. After these brushes make The coils 21 and 22 are contact with the segments 36 and 37, current from the source 12 flows therethrough energizing the coils 21, 22, 23 and 2% which are so wound as to magnetize the cores 19 and 20 in the same direction. As the armature continues to revolve, the brushes 30 and 31,

will engage the segments 34 and and the which has just been described, and current will flow through the armature coils 21., 22, 23 and in a reverse direction, thereby deenergizing the cores 19 and 20 and remagnetizing them with reverse polarity. This reverse polarity of the armature cores takes place substantially at the time these cores. are passing out from under the pole pieces and the polarity a'lter reversal oil? the core; is the same as that of the pole pieces adjacent thereto so that these pole pieces then act to repel the near ends of the cores while the opposite ends of the cores are attracted, thereby causing the motor shaft to rotate.

I claim:

1. In an electric motor, an armature, field members located about said armature, said field members having opposed pole pieces, windings on said ari'nature, relative high voltage means for supplying current to the armature windings as they pass the pole pieces, and means for continuing the armature current comprising a lower voltage sup- P y- 2. In an electric motor, an armature com prising two parallel bars of magnetic mate rial lying one on each side of the axis of the armature, windings on said bars, and means torenergizing said windings on each halt revolution of the armature.

3 In an electric magnet, a core, windings thereon, means for energizing said windings, means for continuing said ener ization wi. .i a lower voltage than that which was primarily applied to energize said magnet, means for rapidly repeating aid 011911,... tion.

In witness whereofl have hereunto set my hand and seal this 17th day of March 192%.

' HENRY K. SANDELL. 

